Today we are making the first public release of Moonlight,
supporting the Silverlight 1.0 profile for Linux. The release
comes in two forms:

No-media codecs supported, but easy to install:
head
to http://www.go-mono.com/moonlight
and click on the cute installer for Moonlight. This
currently hosts builds for Linux x86 and x86-64 for
Firefox.

Update: I apologize for the confussion; This is not
Moonlight 1.0, this is the first source code release
that we are making of Moonlight for interested contributors
and developers. This release is not even a Beta release, as
we are not yet feature complete (missing components in
media codecs, the media pipeline, as well as fixing about 70
known bugs). Apologies for any confussion.

Although Moonlight works on Firefox 2 and Firefox 3, recent
changes in Firefox 3 prevent Silverlight and Moonlight from working (For
details
see #432371,
#430965).
There is
a user
contributed Greasemonkey script that will work around this
bug for some sites (requires Greasemonkey).

Windowless: Moonlight supports "windowless" mode, a
mechanism that allows Silverlight content to blend with other
HTML ements on a page. This is only supported by Firefox 3,
users of older versions of Firefox might run into Silverlight
applications and web sites that do not work correctly as many
Silverlight applications depend on this functionality (Flash
sites have the same problem with Firefox 2).

1.1 and 2.0 support: This release only supports the
Silverlight 1.0 profile. The 1.1 support is no longer
maintained and the release happened at the time when we are
transitioning the APIs to 2.0.